fix(utils): fix mapValues type error

[euijinkk]

Overview

I found mapValues function has two type Error. It's because

1. T generic is not restricted. It is just unknown type. So I fixed it Record object type. But I'm not sure I should consider symbol type. First, I considered symbol, but I found slash team uses ObjectKeys which is for excluding symbol type. So I followed that. I wonder your opinion.
2. Object.entries typing. I fixed it by assertion as slash team wrote in objectEntries.

PR Checklist

• [x] I read and included theses actions below

1. I have read the Contributing Guide
2. I have written documents and tests, if needed.

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[hoseungme]

Thanks @euijinkk .